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Quarterly Results (unaudited)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Results (unaudited)
Quarterly Results (unaudited)
($ in millions, except per share data)
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Revenues
$
8,871

 
$
8,952

 
$
9,164

 
$
8,982

 
$
9,221

 
$
9,028

 
$
9,278

 
$
8,691

Net income applicable to common shareholders
217

 
648

 
242

 
326

 
491

 
621

 
811

 
460

Net income applicable to common shareholders earnings per common share - Basic
0.57

 
1.56

 
0.65

 
0.80

 
1.32

 
1.56

 
2.20

 
1.19

Net income applicable to common shareholders earnings per common share - Diluted
0.57

 
1.53

 
0.64

 
0.79

 
1.31

 
1.54

 
2.18

 
1.18